{"id":"digit-sum-no-validation","text":"`digitSum` performs no input validation; non-digit characters raise `ValueError` from `int(c)`, and `k=0` raises `ValueError` from `range(0, len(s), 0)`.","truth_value":"IN","source":"entries/2026/06/06/calculate-digit-sum-of-a-string-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":["digit-operations-handle-all-nonneg-inputs"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"digit-sum-no-validation","truth_value":"IN","reason":"premise"}]}}